Name in the cause table
Semantic errors in packet filter(s)
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
3GPP Scout / Reference / ESM causes / ESM causes #44 and #45
TS 24.301ESM cause
ESM causes #44 and #45: Semantic or syntactical errors in packet filter(s)
Covers
TS 24.301 words these values in parallel, so they share this page. Each has its own section with the spec text and a plain explanation.
ESM cause #44: Semantic errors in packet filter(s)
In plain words
The network or UE uses this cause to indicate that semantic errors in the request's TFT packet filters caused the service rejection.
Our summary of the spec text quoted below.
When it is used
This ESM cause is used by the network or the UE to indicate that the requested service was rejected due to one or more semantic errors in packet filter(s) of the TFT included in the request.
Source: 3GPP TS 24.301 V20.1.0, clause B.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
ESM cause #45: Syntactical errors in packet filter(s)
In plain words
The network or UE uses this cause to indicate that syntactical errors in the request's TFT packet filters caused the service rejection.
Our summary of the spec text quoted below.
Name in the cause table
Syntactical errors in packet filter(s)
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
This ESM cause is used by the network or the UE to indicate that the requested service was rejected due to one or more syntactical errors in packet filter(s) of the TFT included in the request.
Source: 3GPP TS 24.301 V20.1.0, clause B.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Same causes in 5GS (TS 24.501)
TS 24.501 defines the corresponding causes for 5GS. Their pages quote the 5GS wording.
- 5GSM cause #44 (TS 24.501)
- 5GSM cause #45 (TS 24.501)
How this page was made
3GPP Scout built this page from TS 24.301 V20.1.0 as indexed on 2026-10-15. The quotes are copied from the spec, and code checks each one against the stored text and the 3GPP archive file before publishing. The plain-words lines were written by an AI model (GPT-6 Sol) and checked against the quotes by a second AI model from another company (Claude Opus 5.5). The official 3GPP text governs.